form of graphical projection where the projection lines are parallel to each other
The English used in this article or section may not be easy for everybody to understand. (February 2018)
In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P2 = P. Projections map the whole vector space to a subspace and leave the points in that subspace unchanged.
- Meyer, pp 386+387
- MIT Linear Algebra Lecture on Projection Matrices Archived 2008-12-20 at the Wayback Machine at Google Video, from MIT OpenCourseWare